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    mandybardsley's Avatar
    mandybardsley Posts: 1, Reputation: 1
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    #1

    Oct 6, 2011, 10:19 PM
    How do I start the pilot light on my 1950 AFCO furnace ?
    I have an AFCO furnace from the 1950's. The model number is S 100 MA. My pilot light is out and see two valves. Neither say "on, off, pilot". Any advice out there on how to light it?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Oct 8, 2011, 09:27 AM
    Somewhere there has to be a control valve. Being that old the markings may have worn off but there should still be a detent or some stop. Look for a "P". The other alternative would be to move the knobs until one position allows you to press the knob down. That should be the pilot. Push it down and listen for a hissing or possible smell some gas. When you figure it out, mark the valve.
    JonesHVAC's Avatar
    JonesHVAC Posts: 173, Reputation: 12
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    #3

    Oct 11, 2011, 07:13 PM
    1950's!? Just kidding. Being that old I am going out on a limb and assuming this is a gravity type furnace... if so there is what they call a BASO switch that may need reset... it is a squarish type box roughly 3"x4" with a reddish button on it. A picture or model number would be of great help.
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